1. a combining form meaning "new," "recent," "revived," "modified," used in the formation of compound words: neo-Darwinism; Neolithic; neoorthodoxy; neophyte.
2. Chem. a combining form used in the names of isomers having a carbon atom attached to four carbon atoms: neoarsphenamine.
Also, esp. before a vowel, ne- .
[ néos; akin to NEW ]